Adamantylamino - 5,8 - dihydronaphthyloxypropanols and related compounds



United States Patent "iee 3,534,086

3,534,086 ADAMANTYLAMINO 5,8 DIHYDRONAPHTHYL- OXYPROPANOLS AND RELATED COMPOUNDS Venkatachala Lakshmi Narayanan and Frank Lee Weisenborn, North Brunswick, N.J., assignors to E. R. Squibb 5 & Sons, Inc., New York, N.Y., a corporation of Delaware No Drawing. Filed Oct. 16, 1968, Ser. No. 768,175 Int. Cl. C07c 3/00 US. Cl. 260-490 10 Claims 10 ABSTRACT OF THE DISCLOSURE This invention relates to new adamantylamino-5,8-dihydronaphthyloxypropanols and related compounds of the formula 1 T R R3 I. o-c ca-caii---( ca 2 is l R R 0R and to salts of such compounds, products which are useful in coronary diseases and as antiviral agents.

SUMMARY OF THE INVENTION This invention relates to new chemical compounds of the formula wherein R and R each is hydrogen, lower alkyl or lower alkoxy,

R is hydrogen, lower alkyl or phenyl-lower alkyl,

R R and R each is hydrogen or lower alkyl,

R is hydrogen or the acyl radical of a hydrocarbon carboxylic acid of less than 14 carbon atoms,

m is 0, 1 or 2 and salts of those compounds.

DETAILED DESCRIPTION OF THE INVENTION In Formula I, the lower alkyl groups represented by the various symbols include straight and branched chain saturated hydrocarbon groups such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl, t-butyl, amyl and the like. The lower alkoxy groups are oxygen containing radicals of the same character, e.g., methoxy, ethoxy, propoxy, isopropoxy and the like. The p'henyl-lower alkyl groups also include similar alkyl groups, e.g., benzyl, phenethyl and the like. 7

The acyl radicals represented by R' include lower fatty acid radicals, e.g., acetyl, propionyl, isopropionyl, butyryl, as well as long chain fatty acid radicals such as hexanoyl, 7O heptanoyl, decanoyl, dodecanoyl and the like, aryl, aralkanoic acid radicals such as benzoyl, phenacetyl and Patented Oct. 13, 1970 the like, and l-adamantane carbonyl and adamantylalkanoyl radicals.

As indicated, the adamantyl ring may be unsubstituted or contain one or two substituents of the type described. The ada-mantane ring may be joined directly to the nitrogen atom or through a one or two carbon atom chain.

The various substituents R may be the same or different in a given compound.

The compounds of formula I form acid addition salts with inorganic and organic acids. These acid addition salts frequently provide useful means for isolating the products from reaction mixtures by forming the salt in a medium in which it is insoluble. The free base may then be obtained by neutralization, e.g., with a base such as sodium hydroxide. Then any other salt may again be formed from the free base and the appropriate inorganic or organic acid. Illustrative are the hydrohalides, especially the hydrochloride and hydrobromide which are preferred, sulfate, nitrate, phosphate, borate, acetate, oxalate, tartrate, maleate, citrate, succinate, benzoate, ascorbate, salicylate, methanesulfonate, benzenesulfonate, toluenesulfonate and the like.

Preferred are those compounds wherein R R R R, R and R are all hydrogen, R is hydrogen or acetyl and m is 0, especially when the side chain is attached to the 1-position of the fused ring.

The compounds of this invention are useful as antiviral agents in warm blooded animals, e.g., against influenza virus such as A-PRS or hepatic virus such as MHV by oral or parenteral, e.g., i.p. administration at doses of about 10 to 30 mg./kg./day divided in four to six doses. For example, in mice about 15 mg./kg./ day, orally, are used. For this purpose a compound of Formula I or a physiologically acceptable acid addition salt may be incorporated in a conventional dosage form such asv tablet, capsule, elixir, injectable or the like along with the necessary carrier material, excipient, lubricant, buffer or the like.

They are also useful as antifibrillatory agents, for example, in arresting cardiac arrhythmia in Warm blooded animals, e.g., by inhibition of beta adrcnergic receptors in the myocardium. Single or divided doses of about 5 to 25 mg./kg./day, preferably 4 to 1'0 mg./kg., two to four times daily may be administered in dosage forms as described above. They are also useful as antihypertensive agents, e.g., at 1 mg./kg. i.p. in the rat.

The products of Formula I may be produced by either of two methods described below. The symbols have the same meanings described above.

According to the preferred method, a naphthol of the formula is reduced with a metal like lithium or sodium in liquid ammonia containing an alcohol such as ethanol, isopropan01, t-butanol or the like [e.g., by the procedure described in Organic Synthesis, Coll. rvol. 4, page 877 (1963)] to obtain the 5,8-dihydronaphthol of the formula (III) The compound of formula III is made to react with an epoxide of the formula (Y is chlorine or bromine), to obtain a product of the By refluxing the compound of Formula V With an unsubstituted or substituted adamantylamine of the formula in an inert organic solvent such as n-propanol, benzene or toluene, e.g., for about 16 to 24 hours, yields a product of Formula I wherein R is hydrogen. The ester, i.e., wherein R is acyl, is obtained by esterifying the product of the foregoing procedure with the appropriate hydrocarbon carboxylic acid, e.g., by refluxing the alcohol (Formula I wherein R =H) with the appropriate acid in a solvent like methylene or ethylene chloride using a trace of sulfuric, aryl sulfonic acid or borontrifiuoride as catalyst. In an alternate procedure, the alcohol is heated with the appropriate acid chloride or acid anhydride (obtained from the appropriate hydrocarbon carboxylic acid) in the presence of anhydrous pyridine or sodium acetate.

Examples of such acids include acetic acid, propionic acid, isobutyric acid, hexanoic acid, decanoic acid, benzoic acid, phenylacetic acid, l-adamantane arboxylic acid, 3- methyl-l-adamantaneacetic acid, etc.

The acid addition salts may be formed as previously described.

As an alternate method, an adamantylamine of Formula VI is reacted with a compound of the formula (VII) 5 R4 1 I O B CH '=H Y n OH (Y is a halogen, preferably bromine), e.g., by refluxing two equivalents of the compound of Formula VI with one equivalent of VII in an organic solvent such as chloroform, benzene, toluene or dimethoxyethane for about 6 to 10 hours.

The compounds of Formula VII are prepared by reacting compounds of Formula V With a hydrohalic acid, for example, hydrobromic acid.

Adamantylamines of Formula VI may be produced by several methods. When In is 0 and R is hydrogen, unsubstituted and substituted adamantylamines of the formula R NHCOR is refluxed in a solvent such as tetrahydrofuran in the presence of a reducing agent such as lithium aluminum hydride to obtain a product of the formula R2 Morg n The radical CH R is the same as R When m is one, an unsubstituted or substituted adamantanecarboxylic acid, e.g., l-adamantanecarboxylic acid, 3- methyl 1 adamantanecarboxylic acid, 3 ethyl ladamantanecarboxylic acid, 3 methoxy 1 adamantanecarboxylic acid, 3,5 dimethoxy-l-adamantanecarboxylic acid, or the like is converted to the corresponding acid chloride by treatment with thionyl chloride or oxalyl chloride in benzene to obtain a compound of the formula The latter is treated with an amine R -NH to obtain the amide CONHR Upon reduction with lithium aluminum hydride in tetrahydrofuran there is obtained When m is 2, an unsubstituted or substituted l-bromoadamantane of the formula (XIV) R Br is treated with dichloroethylene and boron trifluoride in an acid such as sulfuric acid to obtain a l-adamantaneacetic acid of the formula This acid is then processed as described above when mislto give (XVI) 11 c1t cir mm The following examples are illustrative of the invention. All temperatures are on the centigrade scale.

EXAMPLE 1 l-(l-Adamantylamino)-3-(5,8-dihydro-1-naphthyloxy- Z-propanol (a) 5,8 dihydro 1-naphthol.A 3-1. three-necked flash, equipped with a Dry Ice condenser, a sealed Hershberg-type stirrer, and an inlet tube, is set up in a hood and charged with 108 g. (0.75 mole) of u-naphthol. The stirrer is started, and to the rapidly stirred flask contents is added 1 l. of liquid ammonia as rapidly as possible (about 5 minutes). When the naphthol has gone into solution (about minutes), 20.8 g. (3.0 g. atoms) of lithium metal is added in small pieces and at such a rate as to prevent the ammonia from refluxing too violently. After the addition of the lithium has been completed (about 45 minutes), the solution is stirred for an additional 20 minutes and is then treated with 170 ml. (3.0 moles) of absolute ethanol which is added dropwise over a period of 30-45 minutes. The condenser is removed, stirring is continued, and the ammonia is evaporated in a stream of air introduced through the inlet tube. The residue is dissolved in 1 l. of water, and,

after the solution has been extracted with two -m1. portions of ether, it is carefully acidified with concentrated hydrochloric acid. The product formed is taken into ether with three 250-ml. extractions, and then the ether extact is Washed with water and dried over anhydrous sodium sulfate. The ether is removed by evaporation to yield 106-108 g. (97-99%) of crude 5,8- dihydro-l-naphthol, M.P. 69-72". This material is dissolved in benzene, treated with charcoal, the solvent is evaporated and crystallized from hexane to give pure 5,8-dihydro-1-naphthol, M.P. 70.5-72.

(b) 1-,( 2,3-epoxypropoxy -5,8-dihydronaphthalene. To a cooled solution of 15 g. (0.1 m.) of 5,8-dihydrol-naphthol and 13.2 g. (0.14 m.) of epichlorohydrin in 38 m1. of p-dioxane, a cold solution of 4.9 g. sodium hydroxide in 10 ml. of water is added dropwise. The mixture is refluxed 3 hours, cooled, and extracted with benzene. The benzene extract is washed with water, dried (MgS0 and evaporated in vacuo to give 1-(2,3- epoxypropoxy) 5,8-dihydronaphthalene. Distillation of the crude oil at 1.2 mm., B.P. 139-140", gives a colorless liquid;

Aglqlix.

film 1250, 910, 840 cm.-

(characteristic epoxy bands), CDCl 4.13

2.5-3.5 ,(aromatic protons).

(c) 1- l-adamantylamino) -3- 5,8-dihydro-1-naphthyloxy)-2-propanol.A solution of 3.0 g. (0.015 mole) of 1-(2,3-epoxypropoxy)-5,8-dihydronaphthalene and 2.25 g. (0.015 mole) of l-aminoadamantane in 100 ml. of toluene is refluxed for 16 hours. Evaporation of the solvent in vacuo gives a thick liquid which solidifies on trituration with dry ether to give 1- (l-adamantylamino)-3-(5,8-dihydrol-naphthyloxy -2-propanol.

(d) 1- l-adamantylamino -3- 5 ,8-dihydro-1-naphthy1- oxy)-2-propanol Alternate Method-From 1-chloro-3- (5,8-dihydro-l-naphthyloxy)-2-propanol.-A solution of 1.1 8 g. (0.015 mole) of 1-chloro-3-(5,8-dihydro-1-naphthyloxy)-2-propanol and 4.5 g. (0.03 mole) of l-aminoadamantane in 20 ml. of benzene is refluxed for 16 hours. The solvent is removed in vacuo, basified and extracted with chloroform. The residue obtained after removal of chloroform, is crystallize'd from ether to give 1-(1- adamantylamino) 3 (5,8 dihydro-1-naphthyloxy)-2- propanol.

Following the procedure of Example 1, but substituting for the l-aminoadamantane of part c the substituted 1- aminoadamantane indicated in the second column, there is obtained 1-[3-R ,5-R l-adamantylamino) ]-3- [5,8-dihydro-l (or 2)-naphthyloxy) ]-2-propanol wherein R and R represent the substituents on the adamantyl ring.

Ex. 5,8-dihydronaphthol l-aminoadamantane 2 5,8-dihydro-1-naphthol. 1-amino-3-methyladamantane.

3 5,8-dihydr0-2-naphthol. 1-amino-3-methoxyadamantane.

4 5,8-dihydro-1-naphthol 1amino-3,5-d.iethyladamantane.

5 do Lamina-3,5dimeth0xyadamantane. 6 5,8-dihydro-2-naphthol l-amino'3-butyladamantane.

7 o. 1-amino-3,5-dimethyladamantaue. 8. 5,8dihydro-1-naphthol. 1-amino-3-methyladamantane.

amino) -3 -,(5,8-dihydro-1-naphthyloxy)-2-propanol having the same substituents R R R and R Example R R R CH CH CzHs H H H CH3 CH C2115 EXAMPLE l4 1-( l-adamantylmethylamino -3- 5 ,8-dihydr0- l-naphthyloxy) -2-propanol max.

(C O of acid chloride).

(b) 1 adamantanecarboxamide.1 adamantanecarboxylic acid chloride (35 g.) dissolved in 70 ml. of dry tetrahydrofuran, is added to a well-cooled aqueous ammonia solution. A white precipitate appears and the mixture is then stirred for 0.5 hr. The precipitate is filtered, washed with water to neutrality and dried over phosphorous pentoxide in vacuo to give l-adamantanecarboxamide; M.P. 186l87.5;

li." il 10 0 of amide) (c) 1-adamantylmethylamine.To a well stirred suspension of 30 g. of lithium aluminum hydride in 1000 ml. of dry ether, 27 g. (0.15 mole) of l-adamantanecarboxamide is added in portions over a period of 1.5 hr. After the addition, the reaction mixture is stirred at room temperature for 1 hour and then is refluxed with stirring for 4 hours and finally is allowed to stand overnight at room temperature. The suspension is well-cooled and 50 ml. of water is added dropwise with vigorous stirring. This is followed by the addition of 100 ml. of 10% sodium hydroxide solution. The ethereal layer is separated and the solid is extracted three times with ether. The combined ethereal layer is dried (MgSO and evaporated in vacuo to give l-adamantylmethylamine as a pale yellow liquid.

(d) l-(l-adamantylmethylamino) 3 (5,8-dihydro-1- naphthyloxy)-2-propanol.Following the procedure of Example 1, but substituting l-adamantylmethylamine for the l-aminoadamantane in part (c) or (d), l-(l-adamantylmethylamino)-(5,8-dihydro l naphthyloxy)-2 propanol is obtained.

Similarly, by utilizing the following (3-R S-R -I- adamantyl)methylamine, produced as in parts (a), (b) and (0) above, instead of l-adamantylmethylamine, the corresponding 1-(3 R 5-R -l-adamantylmethylamino)- 3-(5,8-dihydro-l-naphthyloxy)-2-propano1 is obtained:

8 EXAMPLE 21 1-(N-ethyl-l-adamantylethylamino) -3-(5,8-dihydrol-naphthyloxy)-2-propanol (a) l-adamantaneacetic acid.A solution of 25 g. of l-bromoadamantane in 100 g. of dichloroethylene is added dropwise during 1.5 hour to 100 ml. of sulfuric acid containing 18 g. of boron trifluoride at 8-10". After stirring for 3 hours at 10, crushed ice is gradually added, and the mixture is diluted with water. The crude precipitate (26.5 g.) is dissolved in 10% sodium hydroxide solution, and the cloudy solution is extracted once with ether. The basic solution is cooled, and acidified with 5% hydrochloric acid. The l-adaniantaneacetic acid that precipitates is collected and dried to give 21.5 g. of white solid, M.P. 130-133". The analytical sample crystallizes from methanol-water as long white needles, M.P. 134--l36.

'(b) l-adamantaneacetic acid chloride.To 39 g. of l-adamantaneacetic acid, ml. of thionyl chloride is added with cooling, and the mixture is heated under reflux for 0.5 hour. The excess of thionyl chloride is removed in vacuo, the addition of 2X 50 ml. of dry benzene and evaporation serving to remove the last traces, yielding 1adamantaneacetic acid chloride,

max.

' dry tetrahydrofuran, is added to a well-cooled aqueous ammonia solution. A white precipitate appears and the mixture is then stirred for 0.5 hour. The precipitate is filtered, washed with water to neutrality, and dried over phosphorus pentoxide in vacuo to give l-adamantaneacetamide as white crystals, M.P. 166-168 (d) 1-adamantaneethylamine.To a well-stirred suspension of 20 g. of lithium aluminum hydride in 500 m1. of dry tetrahydrofuran, 35 g. of l-adamantaneacetamide dissolved in 1000 ml. of dry tetrahydrofuran is added in portions over a period of 1.5 hours. After the addition, the reaction mixture is stirred at room temperature for 1 hour, and then is refluxed with stirring for 4 hours, and finally is allowed to stand overnight at room temperature. The suspension is well-cooled and 50 ml. of water is added dropwise with vigorous stirring. This is followed by the addition of 100 ml. of 10% sodium hydroxide solution. Theorganic layer is separated and the solid is extracted three times with ether. The combined organic layer is dried (MgSO and evaporated in vacuo to give 24 g. of l-adamantaneethylamine as a pale yellow liquid. It may be identified as its hydrochloride which separates as white crystals from methanol-ether, M.P. over 280.

(e) N-[2 (l-adamantyl)ethyl]acetamide.-To a solution of 5 g. of l-adamantaneethylarnine in 100 ml. of benzene and 2.5 g. of pyridine, 2.4 g. of acetyl chloride is added dropwise with cooling. After refluxing for 0.5 hour, the-mixture is poured onto 100 m1. of cold water, and the benzene layer is separated. The aqueous layer is extracted once with benzene, and the combined benzene layer is washed successively with water, 5% sodium carbonate solution, 1 N hydrochloric acid, and water. After drying, the benzene layer is evaporated in vacuo to give a thick oil. Trituration with pentane yields N-[2-(1- adamantyl)ethyl]acetamide as a white solid, M.P. 100- 103". An analytical sample is obtained by two crystallizations from ether, M.P. 114-116.

(f) N-ethyl-1-adamantaneethylamine.Using the procedure of part ((1) above, but substituting N-[2-(1 adamantyl)ethyl]acetamide for l-adamantaneacetamide, N-ethyl-l-adamantaneethylamine is obtained. It may be identified as its hydrochloride, which separates as white crystals from acctonitrile, M.P. over 280.

(g) l-(N ethyl 1 adamantylethylamino)-3-(5,8-dihydro 1 naphthyloxy)-2-propanol.Following the pro- 9 cedure of Example 1, but substituting N-ethyl-l-adamantylethylamine for the aminoadamantane in part -(c) or (d), l-(N- ethyl 1 adamantylethylamine)-3-(5,8-dihydro-l-naphthyloxy)-2-propanol is obtained.

are collected, washed thoroughly with water, and purified by crystallization from alcohol.

What is claimed is:

1. A compound of the formula Similarly, by utilizing the following substituted 3-R 5-R -1-bromoadarnantanes in place of l-bromoadamantane in part (a) above and continuing as described, the correspondingly substituted 1-[N-ethy1-2-(3-R 5-R -1- adamantyl)ethylamino] -3-(5,8 dihydro-1-naphthyloxy)- 2-propanol is obtained.

Further by utilizing 5,8-dihydr-2-naphthol in place of 5,8-dihydro-1-naphthol in the foregoing procedure the correspondingly substituted 1-[N-ethyl-2-(3 R 5-R -1- adamantyl)ethylamino-3(5,8 dihydro-2-naphthyloxy)- 2-propanol is obtained.

EXAMPLE 28 1-( l-adamantylamino -3- (5,8-dihydro-1-naphthyloxy) 2-propanol hydrochloride Dry hydrochloride gas is introduced into a solution of 1 g. of 1-(1-adamanthylamino)-3-(5,8-dihydro-l-naphthyloxy)-2-propanol in 200 ml. of dry ether. The precipitate is collected and the hydrochloride is crystallized from alcohol-ether.

EXAMPLE 29 1-( 1-adamantylamino)-3-( 5 ,8-dihydro-1-naphthyloxy)- 2-propyl acetate wherein R and R each is hydrogen, lower alkyl or lower alkoxy,

R is hydrogen, lower alkyl or phenyl-lower alkyl,

R IR and R each is hydrogen or lower alkyl,

R is hydrogen or the acyl radical of a hydrocarbon carboxylic acid of less than 14 carbon atoms,

m is 0, 1 or 2 and acid addition salts thereof.

2. A compound as in claim 1 wherein R to R are all hydrogen, m is 0 and R is lower alkanoyl.

3. A compound as in claim 1 wherein R to R are all hydrogen, m is 1 and R is lower alkanoyl.

4. A compound as in claim 1 wherein R to R are all hydrogen, m is 2 and R is lower alkanoyl.

5'. A compound as in claim 1 wherein R to R are all hydrogen, m is 0 and R is lower alkyl.

6. A compound as in claim 1 wherein R to R are all hydrogen, m is 0 and the attachment is in the l-position.

7. Acid addition salt of the compound of claim 6.

8. A compound as in claim 1 wherein R to R are all hydrogen, m is 1 and the attachment is in the l-position.

9. A compound as in claim 1 wherein R R R to R are all hydrogen, m is 2, R is ethyl and the attachment is in the 1-position.

10. A compound as in claim 2 wherein R to R are all hydrogen, m is 0, R is acetyl and the attachment is in the 1-position.

References Cited UNITED STATES PATENTS 3,415,873 12/1968 Stevens 26050l.l8 3,476,767 11/1969 Beneze 260-570] LORRAINE A. WEINBERGER, Primary Examiner V. GARNER, Assistant Examiner U.S. Cl. X.R. 

